<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:#3333ff">Totally agree with Bryan - I have Synology DS-1621+ - it does have 2 M.2 for cache acceleration. They do provide brackets to install solid state drives into the NAS, similar to others. </div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#3333ff">I replaced my dead Drobo from a few months back with this model - have loved it since. Though the only annoying part thus far is the very expensive ECC memory upgrade. (comes with 4 GB RAM, can be upgraded to 16 GB)</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#3333ff"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#3333ff">Interface/UI is very easy and there are a lot of apps to make your life easier. They do have a capability to connect to the internet, however, I have not enabled it or plan to do so.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#3333ff"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;color:#3333ff">I have 6 "rust disks" ;) and have not gotten a hit on performance, YET - I am running a docker/minecraft server for the kids and his friends (max of 6 kids), a docker/Calibre-Web (2 users), Plex Server for my music, photos uploads from phone, folder sharing between 5 people and a print server for the house. </div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><span style="color:rgb(51,51,255);font-family:verdana,sans-serif"></span> </div><div><span style="color:rgb(51,51,255);font-family:verdana,sans-serif">-GG</span></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 2, 2021 at 11:28 PM Bryan Smith <<a href="mailto:me@bjsmith.me">me@bjsmith.me</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr">On Mon, Aug 2, 2021 at 10:33 PM Thomas Delrue <<a href="mailto:thomas@epistulae.net" target="_blank">thomas@epistulae.net</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Does anyone have experience and/or recommendations for a good NAS with<br>
Solid State drives? Has anyone done this or am I crazy for even wanting<br>
to do this?<br></blockquote><div><br></div><div>Almost all NAS (and SAN) solutions over the last five-plus (5+) years are either two (2) types ... </div><div> - Hybrid NAND cache and optional buffer + platter-backed (i.e., platter is the permanent store), and ...<br></div><div> - NAND-only (no platter)</div><div><br></div><div><div>This is definitely so as NAND not only overtook 2.5" in density, but can far fit more in 2.5" than 3.5" platter can.<br></div><div>E.g., Samsung PM1643 can fit 30TB in 2.5" x 15mm, and 10-20TB in 7-10mm high, and still use no more than 12W (12V@1A), and often under 5W.<br></div><div><br></div></div><div>There are variants on the Hybrid NAND solution, especially since NAND cells <i>'wear out' </i>on writes much faster than magnetic platter, and have a much higher error rate (although such is compensated by firmware).</div><div>But pure NAND NAS/SAN are now becoming very common.</div><div><br></div><div>E.g., I just spec'd out an IBM SVC 2.5" shelf with 0.7PB (0.5PB) usable in a 2U chassis.</div><div>It's only a matter of cost (30TB is about $5K).</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Are there folks running a QNAP device with a properly RAIDed solid state<br>
drive-based array? What are the things to keep in mind, do or<br>
specifically not do?<br></blockquote><div><br></div><div>Before that, consider the fact that there are several types of NAND interfaces. I'll start with the one you know.</div><div><br></div><div>AHCI/SATA - This is the legacy SATA physical connection, legacy host controller interface -- compatible going back to the old IBM PC/Seagate ST506 commanding</div><div><div><br></div><div>SATA, in the 3rd iteration (aka SATA3), as you already know, is ~6Gbps (~0.6GBps at typical 10:8 encoding).</div><div>There is also SAS (Serial Attached SCSI-3), which in quad-channel (SAS uses more conservative signaling), is ~12GBps (~1.2GBpsat typical 10:8 encoding), aka SAS 12Gbps.</div></div><div><br></div><div>AHCI/PCIe - This is the new PCIe x1-4 channel physical connection, but still with the legacy interface for full OS/legacy boot compatibility (ST506).</div><div>nVME/PCIe - This is the new PCIe x1-4 channel physical connection, and with the new, far more parallel interface, but it is not legacy compatible (e.g., need new firmware/OS for boot)</div><div><br></div><div>PCIe 3.0 in a single x1 lane is capable of 10Gbps (~1GBps at typical 10:8 encoding), which is another 2/3rds as fast as SATA in throughput, so x2 is over 3x faster, x4 is over 6x faster.<br></div><div>nVME can also command far more efficiently, and to far more I/O operations than legacy ST506 compatible AHCI that is traditionally used.<br></div><div><br></div><div>When it comes to actual, physical interfaces, there are several now that exist beyond SATA.</div><div><br></div><div>M.2 slot (22mm/0.9" wide, 20-80mm/0.8-3.2" long) - Depending on the keying type, whether B, M or other, there are SATA and/or PCIe x2 or x4 lanes</div><div>U.2 connector (cable) - This is the 'cabled' variant of M.2, actually based on 'SATA Express' (SATA/SAS-connector based, but SATA + PCIe x2), but only provides PCIe x4 lanes (no SATA)</div><div><br></div><div>So ... </div><div><br></div><div>What you're looking for is to find a NAS that can maximize the benefits of NAND devices, especially with M.2 nVME/PCIe x4 (or U.2 nVM/PCIe x4 when it comes to lots of drives/bays).</div><div>I assume this is just for a SOHO system with maybe 5-6 drives max in RAID-6, to give the equivalent 'usable' 3-4 capacity.</div><div><br></div><div>E.g., (6) 1TB drives in RAID-6 = 4TB usable (equivalent of 4 drives usable)</div><div><br></div><div>Now that assumes pure NAND.</div><div>If you're looking for hybrid, there are various options ... including NAS devices that can provide 1-2 M.2 nVME/PCIe x4 slots.</div><div>There are others than only have 2.5" bays.<br></div><div><br></div><div>E.g., I have a tiny little (2.5" based) Synology DS620 (no nVME/PCIe, only AHCI/SATA) and I've populated it as follows ... </div><div>(4) 5TB 2.5"x15mm SATA platters in RAID-5 for 15TB usable<br></div><div>(2) 0.5TB 2.5"x7mm SATA NAND for cache+buffer (read+write) in RAID-1 (write failover)</div><div><br></div><div>Synology requires two (2) NAND devices for buffer (write), otherwise just using one (1) NAND device, will only enable cache (read-only).</div><div>E.g., I could have done ... </div><div>(5) 5TB 2.5"x15mm SATA platters in RAID-5 for 20TB usable</div><div>(1) 0.5TB 2.5"x7mm SATA NAND for cache-only (read-only)</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">- In terms of how to access the data: NFS is the only real requirement,<br>
no samba, or whatever. But scp would be nice too...<br>Like I said: I'm fine sticking with QNAP. I just don't know if I'm crazy<br>
for wanting to stuff it with solid state drives (would NVMe be doable?)<br>
instead of spinning rust ones...or whether this is doable at all.<br>
Are there other considerations that I should take into account?<br></blockquote><div><br></div><div>The biggest problem I have with most SOHO NAS devices is they suck for NFS, and aren't really NFSv4 feature complete. I use them more for iSCSI block (as well as as a media server) but that's another story.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Are there other vendors that I should look at that specifically offer a<br>
device like this?<br></blockquote><div><br></div><div>I'd be interested in finding a capable SOHO NAS vendor that offered IPA + NFSv4 out-of-the-box so I can <i>'drop in'</i> a low-power ARMv8 or BGA (embedded) x86-64 with POSIX (UNIX/Linux) Identity + File in one system. But most vendors are targeting the 98% of SOHO customers that run Windows.</div><div><br></div><div>- bjs</div><div><br></div><div>-- </div><div>Bryan J Smith - <a href="http://www.linkedin.com/in/bjsmith" target="_blank">http://www.linkedin.com/in/bjsmith</a><br></div></div><div dir="ltr">E-mail: b.j.smith at <a href="http://ieee.org" target="_blank">ieee.org</a> or me at <a href="http://bjsmith.me" target="_blank">bjsmith.me</a><br><br></div></div>
_______________________________________________<br>
CALUG mailing list<br>
<a href="mailto:CALUG@unknownlamer.org" target="_blank">CALUG@unknownlamer.org</a><br>
<a href="http://lists.unknownlamer.org/listinfo/calug" rel="noreferrer" target="_blank">http://lists.unknownlamer.org/listinfo/calug</a><br>
</blockquote></div>